Hansson and Fia Jansson are animated characters created specifically for Svenska Sesam by Swedish animator Owe Gustafson, who also produced segments for the American Sesame Street.

Hansson, voiced by Peter Harryson, a bowler-hatted parrot, and Fia Jansson, a female hippo, appeared in inserts; some were primarily comedic, while others taught concepts such as numbers. Fia Jansson could often be seen rising from a pool of water, and in the show's intros, roared like MGM's Leo the Lion. The duo were also featured on the cover of the album Svenska Sesam skivan, which included a track entitled "Kanner du Fia Jansson".